#include "stdio.h"
int main()
{
    int a, b, c;
    scanf("%d%d%d", &a, &b, &c);
    if (a + b > c && a + c > b && b + c > a)
    {
        if (a == b && b == c)
        {
            printf("等边三角形");
        }
        else if (a == b || b == c || a == c)
        {
            printf("等腰三角形");
        }
        else if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a)
        {
            printf("直角三角形");
        }
    }
    else
        printf("不是三角形");
}